Keep us updated. I'm interested to know how well HTC's unlock process works.
Use hTC's little super tool follow their 5 step process to gain the token and input it in your phone to unlock your bootloader; follow their instructions carefully...
In order to obtain the token make copies of adb (Android debug bridge) and fastboot. Then put them in the android folder that hTC will ask you to create. Open up the command prompt, & navigate to the android folder on your C: drive.
Type in the fastboot oem command hTC will tell you to. Get the token and type it exactly over and hTC will email you bootloader unlock key. Do not copy the INFO or (bootloader) prefix, or the process will not register properly.
Now to obtain root. You will have to do all this using the fastboot method & command prompts then reboot in to fastboot to do your first backup image...
Download Clockwork mod Recovery & Superuser. (from the market or wherever you like) Then save it to your fastboot folder so you can find the file path later. Usually: \android-sdk-windows\tools\
Flash clockwork recovery while in fastboot. Then from recovery you will be able to flash superuser, this will give you root.
You will now be rooted with S-on... I don't think you can flash radios or kernels like this with security on...
Now, you are all set to find a custom ROM to flash. (probably some will work, some will not using this method)
I hope this gives someone a push in the right direction that was able to unlock the bootloader & was like now what...
I am beginning to think that the hTC super tool & this hTC Dev .com unlock bootloader thing are two totally different like unrelated things... Weird, I just came to that realization... Oh, well just thought I would throw that in there.
More here...
S-on AND Root - xda-developers